In New York City, Simon is having an affair with a girl whom he have known as twin flame. One night, yakuza gets his girlfriend and they bring her to Japan.
Simon is happening to be a Police under Crime Investigation Division, handles the case, practices how to combat with a sword while searching to where at Japan they possibly go and what is the reason behind of kidnapping his girlfriend.
While on the road in Japan, while asking about the location he suspected, leads him going to the mountains near Mt. Fuji. Accidentally, he arrived at an empty building at the mountains, when a group of ninja fights him with a sword. Fortunately, he have his back the sword and fights back at them, until he defeated them. Suddenly, from the dark area of the building, there is a shadow with a sword showed up, then he saw a girl wearing japanese tradition outfit holding a samurai. She fights him with her prowess with her samurai, until she beats him, left collapsed.
Simon wakes up, when surprisingly, he is at the mountains full of trees and with wood houses at the center. He was tied up at a tree, when samurai girl with group of ninja showed to him. She asked what is his purpose of coming in.
At first, she is not willing to help as it will cause harm in her community, but later was convinced without apparent reason, to help him. She come up with a decision after she made a meditation for several days, calling her to help that man.
They both went around the mountains, while along the road he finds her doing a meditation every day. One day, he accidentally touched her hand, but she gets mad, and said never to touch her again. He finds it weird with a petty reason she gets crazily mad. When he touched her, he feels some kinda unexplainable feeling, but he rejected it.
Yu Ling Long is the shu (born of a concubine) daughter in a general's family. Since her mother was only a tribute dancer, her position is the lowest of the low. She used to live with her mother outside the father's residence, and they only received some monthly money from him. He didn't bother seeing them. But when her mother dies, she moves into the general's residence.
The general is a very irresponsible and violent man. He doesn't really get attached to women, just letting his lust dictate his actions. His wife is a jealous woman, who killed one of his previous concubines, because he doted on her too much. She similarly wants to get rid of Yu Ling Long, in part to vent her frustrations over her husband's cheating habits.
Because the Sixth Miss - the general's legitimate daughter, was bitten by a snake, she needs detoxification. The cure was apparently getting poisoned by scorpions, to fight one poison with another. But since she's already weak, they decided it would be better if she drank the blood of someone poisoned by scorpions instead. The general's madam naturally decided to use Yu Ling Long's blood. During the process of getting bitten by the scorpion, the original timid Yu Ling Long died of fright (and maybe poison? it's never made clear). Then Yu Mei takes over her body.
Yu Mei is a modern woman. She was some mafia boss, so she's very capable with fighting and overbearing attitude. She died because the man she fell in love with betrayed and killed her. So she doesn't trust easily afterward.
Since she took over Yu Ling Long's body, she refuses to adapt to the circumstances of a lowly illegitimate daughter, and uses her violence to fight for a peaceful life, where no one will challenge her and plot against her. Basically, she beats them up into submission. In the meantime, she acquires a tail - a very persistent prince, who only seems to stick to her harder, the colder she treats him. Did ancient men have such heavy tastes, she wonders.